Guddu, a 5-year-old female was brought to the emergency with fever, headache and confusion. A provisional diagnosis of bacterial meningitis was made. The baby developed a severe allergic reaction to penicillin aroud six months back. She was admitted and intravenous antibiotics were staed. Few days later her investigations revealed as: Hemoglobin 6.0 g/L Erythrocyte count 1.2 x 106/mm3 Platelets 60000/mm3 Leukocyte count 1500/mm3 Which of the following is the most likely drug responsible for the above findings?